Mold for ceramic ware.



D. CROSSLEY.

MOLD POR CERAMIC WARE.

APPLICATION FILED P31119, 1912.

LSQ., Patented June 25, 1912.

2 SHEETS-SHEET 1.

WITNESSES Atlanzey [NI/'ENTOR D. GROSSLEY.

MOLD FOR CERAMIC WARE.

APPLICATION FILED 1113.19, 1912.

2 SHEETS-SHEBT 2.

WITNESSES NVENTOR ,QM-z

Patented June 25, 1912.

DAT-TID CROSSLEY, OF TRENTO, NEW JERSEY.

MOLD- FOR CERAMIC WARE.

Speclca-tion of Letters Patent. Patented June 25, 1912.

Application filed February 19, 1912. Serial No. 678,718.I

To all 'whom t may concern.'

Be it known that I, DAVID CRossLEY, a citizen of the United States, residing at Trenton, in the county of'Mercerand State of New Jersey, have invented certain new and useful Improvements in Molds for Ceramic Ware; and I do hereby declare the following to be a full, clear, and exact description of the invent-ion, such as will -enable others skilled in the art to which it appertains to make and use the same.

My invention relates primarily to the ceramic art, has especial reference to means for molding articles of clay, has for its object economy and exactness in the manufacture of earthenware articles, such .as closettanks, lavatories, sinks, bath tubs and the like made under pressure derived from a screw-press, hydraulic or power press or equivalent means, ,by the aid of plaster molds; and the invention consists in certain improvements which will be fully disclosed in the following specification and claims.

In the accompanying drawings, which form part of this specifcation:-Figure 1 represents a vertical longitudinal section partly in elevation o'f one form of devices embodying my invention, with the plunger out of the mold. Fig. 2 is a top plan view showing they .molded article of clay in the mold. Fi 3 is a vertical longitudinal section showing the plunger in the mold and the clay displaced bypressure to form the article contained in the mold. Fig. 4 shows the parts of the plaster mold indetail, and

` Fig. 5 is an end view of the same showing the parts assembled.

. Reference bei had to the drawings and the designatingncilxaracters thereon, the numeral l indicates a preferably cast iron flask or case made in 'two parts pivotally connected by a hinge 2 and having flanges 3, 3, on the opposite side of Ithe flask adapted to be clamped in position to close the flask by a suitable clamp as 4, or of any other -pre-l ferred form. The flask is open at both ends, the inwardly extend-ing horizontal flange 5 at the upper end reducing. its area to preven-t the clay from pushing up the plaster mold and for a purpose hereinafter more fully described, and the inner surface of the flask is machined or finished to present van even surface for the plaster mold to form a continuous bearing thereon to prevent any breakage through or by pressure exerted on the mold. y

6 indicates the plaster of Paris mold, to provide a smooth outer surface of the article molded and is of the contour of the exterior of the article. The mold shown for the purpose of illustratin my invention comprises a section 7 forming the body or major portion of the mold, a section 8, forming the bottom of the mold, and a section 9, forming the front of the mold, and said sections are securely held in position by metallic bandslO and 11, which surround the assembled mold.

12 indicates a conventional press provided with a screw threaded rod 13, which is properly connected to the metal-lic plunger 14 for applying pressure tothe plunger for displacing the clay, and filling the space between the plaster mold and the plunger 4and forming the molded article under pressure. The plunger is of the contour of the interior of the article molded andis provided with a covering or external wall 15 of plaster of Paris whlch incloses or surrounds the body of the plunger and also covers the lower end to provide or form a smooth innen. surface for the article to be molded. The plaster is secured to the plunger by dove-tails 16, or in any preferred manner. The plun er 14 is provided with a shoulder 19, which in the descent of the former, enters the opening in the upper end of the flask 1, bounded by the laterally extending flange 5.

The flask 1 and the mold 6 rest upon a base, table, or the like 17, while the article 18 is being molded. v

The operation is as follows: The flask 1 is opened by swinging the side 20 outward, when the plaster-mold 6 is'inserted, with the bands 10, 11 engaging the grooves 10, 11', the side 20 is then closed and secured by the clamps 3, 4. Clay in a predetermined quantity is then put in the mold 6 and the plunger 14 forced down slowly into the mold by the screw 13, which gradually displaces the clay in the mold, but there is no pressure exerted on the clay until the shoulder 19 enters the opening in the upper end of the case surrounded by the iiange 5, when the further descent of the plunger produces an equalization of density throughout the molded article and augmente the absorption of the liquid in the clay by the crous mold.

sections of the mold prevented by the bands 10 and 11 until the mold is placed upon a suitable rack to dry.

While I have shown the application 2of a,

conventional screw press to the" plunger it isv obviousr that for molding offlarge articles, hydraulic or power presses ."xay be employed .as requiredto furnish tlfe" necessary pressure. 4.

In the 'formation of the plaster mold, it is reinforced by embedding therein galvanized steel window screen wire tostiffen the mold, and in forming the article molded, thev clay is mixed with grog and the clay is very stiff, and to prevent the clay sticking to the mold, oil is also used in some classes of clay.

It is 'obvious that the plaster of Paris mold is absorbent, and that other absorbent material may be used.

Having thus fully described my inven.

1. A metallic flask or case, a mold of absorbent material engaging the inner surfad of the wall of the flask-and having the contour of the exterior of an article to be molded, a plunger adapted to enter said mold and having the contour of the interior of said article, and means for operating said lunger, for gradually displacing clay an filling the s ace between the mold and the plunger with the clay, and for applying pressure to the upper part of the article to produce equalization of density throughout said article.

2. A two part metallic ask or case separably secured together, a sectional plaster mold engaging the interior of the flask and having the contour of the exterior of an article to be molded, a movable plunger having the contour of the interior of said article and adapted to enter said mold, and means for operating said plunger for gradually displacing clay, filllng the space between the mold and the plunger with clay and for equalizing the densitythroughout the article.

3. A metallic flask or case, a sectional -mold of absorbent material engaging the in ner surface of the wall of the flask and having the contour of the exterior of an article to be molded, bands surrounding and securing the sections of the mold, a plunger having the countour of the interior of said article and adapted to enter thev mold, and means for operating said plunger for gradually displacingclay, llmg the space between the mold and the plunger vsith-clayy and for equalizing the density throughout the article.

4. A metallic flask or case machined or said plunger for gradually vdis l cing clay Y' in the mold, filling-the 's ace tween the mold and the pluliger with clay and for eqlalizing the denslty throughout the artic e. A

5. A metallic fiask or -casea plaster mold engaging the inner surface of the wall of the flask and having the contour of the exterior of an article to be molded, a plunger having the contour of the interior of said article and provided with a porous covering or outer surface, and means for applying pressure to the plunger for displacing clay and filling the space between the mold and the plunger with clay for equalizing the density throughout the article.

6. A metallic -fiask having a removable side and provided with internal grooves or recesses, a sectional plaster mold closely engaging the interior surface of said ask and provided with bands for securing said sections in position and engaging said recesses, a plunger, and means for forcibly displacing clay and forming an article under pressure,

7. A metallic ilask, a mold of plaster within the flask of the contour of the exterior of an article to be molded, a plunger within the mold having `the contour -of the interior of said article and forming a space between the mold and the plunger of the contour of the article, and means for operating said plunger to displace clay in the mold, fill said space with clay and for completing said article under pressure.

8. A ask having open ends and a vremovable side, a mold having the contour of the exterior of an article to be molded engaging the inner surfaceof the wall of the flask, a plunger having the contour of the interior of said article, said mold and.

plunger having the contour of the interior of the article and movable within the mold,

5 having the contour of the eterior of an and means for displacing clay and `for covering, and means for distribl'lting.` the equalizngv-its densit 10.` A metallic fles a mold of .reinforced In testimony whereof I aiix my signaabsorbent material within said ask and ture, in presence of two witnesses.

DAVID CROSSLEY. article tb` be molded, a plunger Iwithin said Witnesses: i mold having the contour'of' the interior of FRANK M. TOMER, said article andprovided with an absorbent WM. J. HARRIS.

clay and for equalizing its density. 10 

